Well i just installed a new aluminum fuel cell and in-line fuel pump in my 2004 gmc sierra. I bypassed the emmisions stuff to make the install more simple, what i am wondering is there anyway to disable the check engine light for the emisions, i have a programmer. Also my tank doesnt have a tank pressure sensor like the factory will that hurt anything. I know this is alot of questions at one time, but i need help. thanks in advance.